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3:00 2:59 2:58 2:57 2:56 2:55 2:54 2:53 2:52 2:51 2:50 2:49 2:48 2:47 2:46 2:45 2:44 2:43 2:42 2:41 2:40 2:39 2:38 2:37 2:36 2:35 2:34 2:33 2:32 2:31 2:30 2:29 2:28 2:27 2:26 2:25 2:24 2:23 2:22 2:21 2:20 2:19 2:18 2:17 2:16 2:15 2:14 2:13 2:12 2:11 2:10 2:09 2:08 2:07 2:06 2:05 2:04 2:03 2:02 2:01 2:00 1:59 1:58 1:57 1:56 1:55 1:54 1:53 1:52 1:51 1:50 1:49 1:48 1:47 1:46 1:45 1:44 1:43 1:42 1:41 1:40 1:39 1:38 1:37 1:36 1:35 1:34 1:33 1:32 1:31 1:30 1:29 1:28 1:27 1:26 1:25 1:24 1:23 1:22 1:21 1:20 1:19 1:18 1:17 1:16 1:15 1:14 1:13 1:12 1:11 1:10 1:09 1:08 1:07 1:06 1:05 1:04 1:03 1:02 1:01 1:00 0:59 0:58 0:57 0:56 0:55 0:54 0:53 0:52 0:51 0:50 0:49 0:48 0:47 0:46 0:45 0:44 0:43 0:42 0:41 0:40 0:39 0:38 0:37 0:36 0:35 0:34 0:33 0:32 0:31 0:30 0:29 0:28 0:27 0:26 0:25 0:24 0:23 0:22 0:21 0:20 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:09 0:08 0:07 0:06 0:05 0:04 0:03 0:02 0:01 0:00 Do Now Draw an Atom with your lab group Go to your lab table Agree upon a design One person from each group will draw their groups atom on the board You have 180 seconds before someone must begin drawing on the board

Don’t know! Democritus was a Greek Philosopher (~460 BC) He proposed that all matter is composed of tiny particles o He called the particles atomos (Greek for “uncuttable”) o He said the particles are invisible o He said the particles cannot be broken down into smaller parts and cannot be destroyed o He believed atoms of different substances had different geometric shapes His idea did not gain acceptance o He couldn’t explain what held the particles together o He couldn’t explain how they caused a substance’s properties

Aristotle proposed that there are four elements: [1] earth; [2] air; [3] fire; and [4] water His idea gained acceptance because substances appeared to have different degrees of each of these building blocks. Example: a burning, green stick releases: smoke (air); sap (water); and ash (earth)

Early theories of matter are no longer accepted because of:

30 g of carbon are burned in the open air where there is plenty of oxygen. 110 g of a carbon oxide forms.  How much oxygen combined with the carbon? 30 g of carbon are burned in a closed container under conditions of low oxygen. 70 g of a carbon oxide forms.  How much oxygen combined with the carbon? What is the ratio of the masses of the oxygen combined with carbon in Experiment 1 and Experiment 2?

This is the arrangement of nuts and bolts found in Container 1. This is the arrangement of nuts and bolts found in Container 2. How does the mass of the nuts in Container 1 compare to the mass of the nuts in Container 2? o Why? o What assumptions did you make about the nuts to reach this conclusion?

Regents Questions